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Patented Nov. 25, 1919.

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raraa r. Garments, or Business; MARYLAND, ASSIGNOR, BY manor AND mssna ASSIGNME ,1 A COOTION E ISYLV TO FLANNEBY BOLT COMEAZNY, Q1? PITTSBUBGI E, PENNSYLVANIA,

stamens STAYBOLT.

Specification of Letters Patent.

Patented Nov.25, i919.

" application filed August a, 1915. Serial no. cases.

To all whomit may concern:

Be it known that I, PETER F. GALLAGHER, a citizen of the United States, residing in the cityof Baltimore and State of Maryland, have invented newanduseful Improvements in Flexible Staybolts, of which the following is a specification,

My invention relates to flexible stay bolts I for connecting the outside and fire box sheets of a boiler, and particularly to an] improved construction of seat flange or thimble in which the outer end or head of the bolt is pivotally mounted, and mode of connecting said flange or thimble to the outside sheet.

The object of the invention is to provide a construction of flan e or thimble and wall .or outside sheet, w ereby the flange or thimble may be firmly secured within ,a receiving opening in the sheet against any possibility of becoming loosened or disconnected, glving all of the advantages of an integral connection of the thimble or flange with the sheet at less cost while enabling new flanges or thimbles to be applied in case of damage or injury to those-in use.

A further object of the invention is to provide a flange or thimble which overcomes the disadvantages of threaded thimbles or sleeves in strengthening instead ofweakening the outside sheet about the bolt hole, and which may be set at any angle to bring the bolt holes in the inside and outside sheets into alinement, thus disposing the bolt so that the pulls resulting, from stresses and; strains will fall u on the bolt and sheet conand 3 the stay bolt. As shown in .the present instance, the sheet 1 is provided with a threaded opening 4 in which the threaded inner end 5 of the'bolt is fitted and secured,

' such end of the bolt being riveted or headed,

as shown at 6. This end of the bolt may,

The outer end of the bolt 3 is provided with a head 7 having a partly spherical con:

vex surface 8. This surface 8 pivotally engages a concaved seat surface 9 within the outer end of a seat flange, sleeve or thimble 1( so as to permit the bolt to have proper pivotal movements to accommodate itself to expansion and contraction of the boiler sheets. The outerend of the said seat flange or thimble is of cylindrical form and is externally threaded, as shown at 11, for engagement with the threaded flange of the usual 'cap or cover 12, between which and the outer edge of the flange or thimble may be interposed an elastic gasket 13.

In accordance with my invention, the wall or sheet 2 is provided with a receiving opening 14.- which flares in an outward direction, being of smallest diameter at its inner end 75 and of maximum diameter at its outer end, and having its wall inclining at substantially an oblique angle in an outward direction. This opening receives the inner end 15 p of the thimble 10 which is bell-mouthed in 8 0 shape or flared to a corresponding degree in/ the opposite direction. The inner end of thc\ thimble is arranged to lie flush with the inner surface of the sheet 2, and by reason of the relative outward divergence of the 85,-

wall of the opening 14; and inner end of the" thimble a flaring space 161s provided within the inner end of the thimble to permit the .bolt to have free universal pivotal motion, while a V-shaped annular channel or recess is provided between the inner end of the thimble and the wall of the opening 14 to receive a welding filling 15 of a suitable welding metal or composition.

In preparing the outside sheet for the reception of the seat thimbles, the openings 14 are first formed and the inner ends of the thimbles fitted in position, the welding composition or filler introduced and the weld made by the use of an oxy-acetylene welding apparatus, thus fusing the metals together so that the union between the sheet and this means all of the advantages of a flang thimble is of a homogeneous character. By'

or thimble inte al with thesheet may be 05 obtained, name y, greater strength and rigidity and freedom from leakage, loosening or disconnection of the parts at the joint,

By reason of the shape of the opposing surfaces of the opening 14 and thimble any possible tendency to displacement of the thimbleis resisted by a union of wedge for-- mation, whereby maximum resistance to deflection, fracture or displacement is secured.

In constructing a locomotive boiler it is not absolutely necessary to stay the outside wrapper sheet, since, owing to its contour, this sheet has suflicient strength in itself, but it is necessary to stay the inside or fire box sheet, and to this end flexible stay bolts are commonly employed which are extended between and connected with the two sheets, and which, owing to the different curvatures of the inside and outside sheets, are arranged in radial series struck from difle'rent centers. Owing to this arrangement, some of the bolts extend at an angle, making it impossible, with the use of threaded sleeves or thimbles, to secure more than one complete thread for the connection of the thimble in the thickest part of the metal of the outside sheet, which is ordinarily not more than onehalfeinch. The objection to this is that a after the boiler is in service leakage starts at the threaded opening, and as, with the use of a threaded sleeve, there is but a single.

thread to depend upon, it is usually the case that the sleeve has to be removed, the hole retapped and another threaded sleeve applied, which only overcomes the trouble temporarily. render the use of thread sleeves annoying and a source of considerable trouble and expense in requiring frequent repairs to be made.

. side and outside sheets become relatively .dis-

torted, sufliciently in many cases to throw thesets of boltholes out of alinement and cause angular strain upon the stay bolts. In renewing a fire box sheet, it also frequently happens that the substitute fire box sheet is not always the exact duplicate of the original, and hence when this new fire 'box sheet is set in position forconnection the sets of cooperating stay bolts are not disposed in proper alinement. In the use of threaded sleeves or thimbles, it is hard to overcome this diiiiculty, and it can not be overcome without some of the bolts being set at an angle, with the result that the pulling strains are transmitted at an angle to the of the bolt. Again the welding connection of the thimble or sleeve with thesheet makes a connection absolutely proof against leak- These and other objections Owing to differences in expansion and contraction, it frequently occurs that the inage, and also makes the sheets stronger and more substitution, except in case of actual damage, of new sleeves for the original sleeves to prevent leakage is entirely avoided and over come.. Furthermore, as indicated clearly in Figs. '2 and 3, in the event that the coacting durable about the bolt hole, and-the bolt holes in the inside and'outside sheets tion or the other to bring the bolt holes in alinement, as will be readilyunderstood.

Other advantages of my improved thimble or sleeve is, that it allows a greater degree of flexibility thanother forms of sleeves or thimbles, that it is stronger and more durablethan any other sleeve or thimble because it may be made heavier than ,a threaded thimble, and after being welded into the sheet gives both greater strength and durability to itself as well as to the sheet. Moreover, the thimble maybe bent or set to lie at any acute angle, to dispose the bolt properly for a straight pulling strain along its fixed radial line, without any tendency to cause leakage, as is the case in the use of threaded sleeves.

Further, the application of the thimble by the method is permanent, it not being necessary to renew this thimble unless the outside sheet is removed.

I claim 1. In a stay bolt connection for boilers, the combination of an outer sheet having an opening, a thimble within the opening and of a shape andsize whereby it may be ad- H justed at different anglesto aline with the bolt opening in the other sheet, the said.

inner end fitted within said opening, a substantially V-shaped recess being thereby formed between the wall of the opening and flared portion of the thimble, a welding filler of wedge formation in cross section occupying said recess and binding the thimble in a substantially homogeneous manner to the boiler sheet, and a stay bolt having pivotal engagement with said thimble.

3. .The combination with a boiler sheet and a thimble forming a bearing sleeve for a bolt, said boiler sheet provided with an opening having a part appreciably greater in diameter than the diameter of a portion of the bearing sleevewhich enters said opening, whereby an annular space is formed to receive welding material to weld the sleeve .tion, althimble having a reversely flared i eee ee I 1 Q to the boiler sheet, and which permits of? the adjustment of the sleeve to eline with the stay bolt hole in the inner sheet of the boiler.

4:. lhe combination of a boiler sheet having a stay bolt opening therein, e hearing sleeve entering sald opening, there being a space between the sleeve and the Well of the opening, and welding material within said space and fused to the sleeve and well of the opening, the said sleeve having a heer- 10 mtherein for the heed of a stay bolt.

11 testimony whereof I efix my signature in presence of two Witnesses.

PETER F. GALLAGHER. Witnessesi I ERNEST GRIFFETH, C. GERARD AIKEN. 

